Roller bit



Ma l, 192a 1,668,100

- T. H. WOBERMIN v ROLLER BIT Filed April 21. 1926 INVEN'TOR.

A TTORNEYS.

direction at right angles to that of TES PATENT THEODORE n. WOBEBMIN, or wm'rrma, imam.

1,668,100 FHCE-Q ROLLER BIT.

Application filed Apr1121,1926. Serial No. 103,440.

This invention relates to earthboring tools having cutters formed by rollers which crush the formation. Such tools are commonly employed-for drilling deep 'holes by the rotary hydraulic method, wherein the cuttings and thedetritus are removed by circulating wash liquids known as slush or mur However, this wash liquid is hereafter referred to as water. -.The wash water becomes dense at the bottom of the hole forming a plastic mass which readily packs cavities and recesses. Heretofore, it has been the practice to mount the rollers within overhanging portions of the body of the tool so that the rollers are partially housed. This results in forming cavities wherein mud may pack, interfering with the rotation 01 the rollers, hindering the more fluid portion of the mud from washing and cooling the bearings and rollers, and also by reason of faulty rotation causing excessive wear on the cutting surfaces of the rollers.

The objects of this invention are first to provide a tool of this character which is arranged so that the rollers readily free themselves of mud; second, to provide a structure having water courses delivering wash water to the rollers in such manner as to readily remove accumulations thereon; third, to provide a structure wherein the rollers are unenclosed by any portion of the body; and fourth, to provide a tool of the character described having rollers and bearings which are strong and are so situated that they may be easily and readily replaced.

These objects together with other objects and corresponding accomplishments are obtained by means of the embodiment of my invention illustrated in the accompanying drawing in which:

Fig. 1 is an elevation of the tool; Fig. 2 is a view of the tool as seen looking in a Fig. 1; Fig. 3 is a section as seen on the line '33 of Fig. 2; and Fig. 4 is a fragmentary section on an enlarged scale as seen on the line 4-4 f Fig. 1.

Referring more particularly to the drawing, the body of the tool has a cylindrical intermediate portion 5, a tapered pin '6 which is threaded, and a head end 7 to which the rollers are connected, The pin 6 serves for connection to the drill pipe whereby the tool may be rotated. Communicating with the bore of the pipe is a passage 8 extending into the body and ending in' watercourses -9 communicating with the outside 'ofthe body. *Formed on the head end'T-are faces 10 converging downwardly, and extending therefrom -are tapered threaded pins 11. The head end is formed with faces 12 diverging 'downwardly, diametrically opposite and inter mediate faces 10. Extending normal to the faces 12 are tapered threaded pins 13.

By comparing Figs. 3 and 4 of the draw- .ing with either Fig.1 or Fig. 2 it will be noted that thethreads on pins 11 and 13 run in the opposite direction to the threads on pin 6. The tool as illustrated is intended to be revolved iu ra right direction and has right hand threads'ou pins 6 accordingly. The rollers,being in contact on their lower portions rotate in a left hand direction and by the drag which they exert on the bushings tend to screw these on the pins 11 and 13 which have left hand threads. This continual tendency to screw these on, effectually prevents any tendency for the bushings and rollers to come off and renders unnecessary the usual means taken to secure such rollers in place. If a left hand tool was under consideration, the threads would of course be of the opposite hand.

Mounted upon pin 11 is a divided bearing bushing comprising a sleeve portion 14 and an end flange 15. The other section of the bushing has a'sleeve portion 16 and a flange 17. The tapered pin provides a pin having a thickroot so that a strong construction is obtained. Sleeve 16 is of less diameter than sleeve 14 so that sufficient stock to provide strength and take care of wear will be obtained. There are two rollers mounted upon the bearing sleeve, the larger one being indicated by 18 and the smaller one by 19.

These rollers are formed with teeth in the usual manner. It is obvious that the rollers may be removed by unscrewing the outer section of the bushing, thereby permitting replacement of the rollers. The bushing may be replaced'by then removin the inner section and placing another bus ing upon the stem. Two rollers are used as a matter of convenience. It will be noted that the water courses 9 open above the rollers, and the sprays therefrom will be directed downwardly over the rollers. The *rollers just described, being on the outside of the body are free of any obstructions which might hinder the circulation of wash water, and there are no spaces wherein mud may pack.

ing a substantially cylindrical upper portion, set of dia lower portion provided with a ann-trirally opposite faces converging downwardly and a set of faces intermediate the first set diverging downwardly, shafts projecting normally jonrnallml on said shafts and disposed wholly without said body.

2. A boring tool comprising a body having a substantially cylindrical upper portion, a

from said faces. and rollers lower portion provided with a set of dia metrically opposite faces Converging downwardly and a set of faces intermediate the first set diverging downwardly, shafts projecting normally from said faces, and rollers jonrnalled on said shafts so that a diametrically opposite set track within the other set, said rollers being disposed wholly without said body.

3. A boring tool comprising albody having a substantially cylindrical upper portion, a lower )ortion provided with a pair of diametrically opposite faces converging downwardly aml a pair of faces intermediate the first pair diverging downwardly, shafts rojecting normally from said faces, and r0 lers -jonrnalled on said shafts so that a diametrically op )osite pair track within the other pair, Stllt rollers being disposed wholly without said body.

In witness that I claim the foregoing I have hereunto subscribed my name this 10th ril, 1%6.

day of A HEODORE H. \VOBERMIN. 

